AJAX (Asynchronous JavaScript and XML) is a popular technique for creating interactive websites, by providing a concept for data exchange between client and server asynchronously.

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PHP/Ajax Data transmission security

I'm learning about web security mechanisms. I have developed the following system in PHP and JavaScript: assuming that I have a page named: messages.php which is a real-time chat system. first when ...
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Is it a security issue? Blocked from seeing Access-Control headers when making AJAX calls to an API?

I was developing and sending requests to a server with no Access-Control-Allow-Origin headers original. After submitting a request for the header to be added to the server, the API is now open to ...